声明的dim buf$类型怎么才能清空啊

[ky22334]

Private Sub Command30_Click()
Dim buf$
buf = "123"
'怎么能把这个buf清空后存放abc呀
End Sub

[Hassle]

不需要自己考虑内存的管理的
buf = "abc"就可以了

============================
如果一定要自己清理内存的话，可以这样

Private Declare Sub ZeroMemory Lib "KERNEL32" Alias "RtlZeroMemory" (dest As Any, ByVal numBytes As Long)

ZeroMemory byval strptr(buf), lenb(buf)

[ZOU_SEAFARER]

Private Sub Command30_Click()
Dim buf$
buf = "123"
buf=vbnullstring '加上这个还比较麻烦
buf="abc"
End Sub

[Dunzip]

buf="abc"
这样简单有效，其他的都是画蛇添足了

[cike_1111]

清空?
该字符串直接为 "" 就可以!

Dim buf$
buf = "123"
buf="" (这个就是空的了)